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Concept-wise Practice

cotangent MCQ Questions for Class 11

cotangent se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

36 questions tagged with cotangent.

यदि \(\cot x=3\), तो \(\cosec^2 x\) का मान क्या है?

If \(\cot x=3\), what is the value of \(\cosec^2 x\)?

Explanation opens after your attempt
Correct Answer

B. 10

Explanation

Simple Explanation

पहचान \,\(\cosec^2 x=1+\cot^2 x\) का प्रयोग करें। यहाँ \(\cot x=3\), अतः \(\cot^2 x=9\)। इसलिए \(\cosec^2 x=1+9=10\)। विकल्प 9 केवल \(\cot^2 x\) का मान है, \(\cosec^2 x\) का नहीं। परीक्षा टिप: \(1+\cot^2 x=\cosec^2 x\) पहचान में 1 जोड़ना न भूलें। / Use the identity \(\cosec^2 x=1+\cot^2 x\). Given \(\cot x=3\), we get \(\cot^2 x=9\). Therefore, \(\cosec^2 x=1+9=10\). Option 9 is only the value of \(\cot^2 x\), not of \(\cosec^2 x\). Exam tip: In the identity \(1+\cot^2 x=\cosec^2 x\), do not forget to add 1.

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\(\cot\left(\frac{\pi}{2}-\theta\right)\) किसके बराबर है?

What is \(\cot\left(\frac{\pi}{2}-\theta\right)\) equal to?

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Correct Answer

D. \(\tan \theta\)

Explanation

Simple Explanation

\(\frac{\pi}{2}-\theta\) पर cotangent का co-function tangent होता है। परीक्षा में reciprocal function pair याद रखें। / At \( \frac{\pi}{2}-\theta\), cotangent changes to the co-function tangent. In exams remember reciprocal function pairs.

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\(\frac{1}{\cosec x-\cot x}\) किसके बराबर है?

What is \(\frac{1}{\cosec x-\cot x}\) equal to?

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Correct Answer

C. \(\cosec x+\cot x\)

Explanation

Simple Explanation

क्योंकि (\(\cosec x-\cot x\)\(\cosec x+\cot x\)=1)। इसलिए आवश्यक व्युत्क्रम \(\cosec x+\cot x\) है। / Since (\(\cosec x-\cot x\)\(\cosec x+\cot x\)=1). Hence the required reciprocal is \(\cosec x+\cot x\).

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यदि \(\cosec x+\cot x=4\), तो \(\cot x\) का मान क्या है?

If \(\cosec x+\cot x=4\), what is the value of \(\cot x\)?

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Correct Answer

B. \(\frac{15}{8}\)

Explanation

Simple Explanation

\(\cosec x-\cot x=\frac{1}{4}\) होगा। घटाने पर \(2\cot x=4-\frac{1}{4}\), इसलिए \(\cot x=\frac{15}{8}\)। / \(\cosec x-\cot x=\frac{1}{4}\). Subtracting gives \(2\cot x=4-\frac{1}{4}\), so \(\cot x=\frac{15}{8}\).

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यदि \(\sin x-\cos x=\frac{1}{3}\), तो \(\tan x+\cot x\) का मान क्या है?

If \(\sin x-\cos x=\frac{1}{3}\), what is the value of \(\tan x+\cot x\)?

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Correct Answer

A. \(\frac{9}{4}\)

Explanation

Simple Explanation

वर्ग करने पर \(1-2\sin x\cos x=\frac{1}{9}\) मिलता है। इसलिए \(\sin x\cos x=\frac{4}{9}\) और \(\tan x+\cot x=\frac{9}{4}\)। / Squaring gives \(1-2\sin x\cos x=\frac{1}{9}\). Thus \(\sin x\cos x=\frac{4}{9}\) and \(\tan x+\cot x=\frac{9}{4}\).

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यदि \(\sin x+\cos x=\frac{7}{5}\), तो \(\tan x+\cot x\) का मान क्या है?

If \(\sin x+\cos x=\frac{7}{5}\), what is the value of \(\tan x+\cot x\)?

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Correct Answer

B. \(\frac{25}{12}\)

Explanation

Simple Explanation

वर्ग करने पर \(1+2\sin x\cos x=\frac{49}{25}\), इसलिए \(\sin x\cos x=\frac{12}{25}\)। अब \(\tan x+\cot x=\frac{1}{\sin x\cos x}=\frac{25}{12}\)। / Squaring gives \(1+2\sin x\cos x=\frac{49}{25}\), so \(\sin x\cos x=\frac{12}{25}\). Now \(\tan x+\cot x=\frac{1}{\sin x\cos x}=\frac{25}{12}\).

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यदि \(\cot x=\frac{3}{2}\), तो \(\frac{\cot^2 x-1}{\cot^2 x+1}\) का मान क्या है?

If \(\cot x=\frac{3}{2}\), what is the value of \(\frac{\cot^2 x-1}{\cot^2 x+1}\)?

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Correct Answer

A. \(\frac{5}{13}\)

Explanation

Simple Explanation

\(\cot^2 x=\frac{9}{4}\) रखकर सरल करें। मान \(\frac{\frac{9}{4}-1}{\frac{9}{4}+1}=\frac{5}{13}\) है। / Substitute \(\cot^2 x=\frac{9}{4}\) and simplify. The value is \(\frac{\frac{9}{4}-1}{\frac{9}{4}+1}=\frac{5}{13}\).

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(\sin-2 x\(1+\cot^2 x\)) का सरल मान क्या है?

What is the simplified value of (\sin-2 x\(1+\cot^2 x\))?

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Correct Answer

B. \(1\)

Explanation

Simple Explanation

पहचान \(1+\cot^2 x=\cosec^2 x\) का प्रयोग करें। अतः \(\sin^2 x(1+\cot^2 x)=\sin^2 x\cdot\cosec^2 x=\sin^2 x\cdot\frac{1}{\sin^2 x}=1\)। इसलिए सही उत्तर \(1\) है। \(\sin^2 x\) केवल गुणनखंड है, सरल मान नहीं। परीक्षा टिप: \(1+\cot^2 x\) दिखते ही \(\cosec^2 x\) वाली पहचान याद करें। / Use the identity \(1+\cot^2 x=\cosec^2 x\). Thus, \(\sin^2 x(1+\cot^2 x)=\sin^2 x\cdot\cosec^2 x=\sin^2 x\cdot\frac{1}{\sin^2 x}=1\). Therefore, the correct answer is \(1\). \(\sin^2 x\) is only a factor, not the simplified value. Exam tip: When you see \(1+\cot^2 x\), recall the \(\cosec^2 x\) identity.

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\(\frac{\cosec x}{\cot x}\) का सरल मान क्या है?

What is the simplified value of \(\frac{\cosec x}{\cot x}\)?

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Correct Answer

B. \(\sec x\)

Explanation

Simple Explanation

\(\cosec x=\frac{1}{\sin x}\) और \(\cot x=\frac{\cos x}{\sin x}\) रखें। अनुपात \(\frac{1}{\cos x}=\sec x\) होगा। / Put \(\cosec x=\frac{1}{\sin x}\) and \(\cot x=\frac{\cos x}{\sin x}\). The ratio becomes \(\frac{1}{\cos x}=\sec x\).

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\(\frac{\tan x+\cot x}{\sec x\cosec x}\) का सरल मान क्या है?

What is the simplified value of \(\frac{\tan x+\cot x}{\sec x\cosec x}\)?

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Correct Answer

A. (1)

Explanation

Simple Explanation

\(\tan x+\cot x=\frac{1}{\sin x\cos x}\) और \(\sec x\cosec x=\frac{1}{\sin x\cos x}\) होता है। इसलिए अनुपात (1) है। / \(\tan x+\cot x=\frac{1}{\sin x\cos x}\) and \(\sec x\cosec x=\frac{1}{\sin x\cos x}\). Hence the ratio is (1).

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\(\frac{\cos(2\pi-x)}{\sin(\pi+x)}\) का सरल मान क्या है?

What is the simplified value of \(\frac{\cos(2\pi-x)}{\sin(\pi+x)}\)?

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Correct Answer

B. \(-\cot x\)

Explanation

Simple Explanation

सर्वसमिकाओं \(\cos(2\pi-x)=\cos x\) तथा \(\sin(\pi+x)=-\sin x\) का प्रयोग करने पर \[\frac{\cos(2\pi-x)}{\sin(\pi+x)}=\frac{\cos x}{-\sin x}=-\cot x.\] अतः सही उत्तर \(-\cot x\) है। \(\cot x\) लेने पर हर के ऋण चिह्न की उपेक्षा हो जाएगी। परीक्षा टिप: \(\pi+x\) वाले कोण में sine का चिह्न ऋणात्मक होता है। / Using the identities \(\cos(2\pi-x)=\cos x\) and \(\sin(\pi+x)=-\sin x\), \[\frac{\cos(2\pi-x)}{\sin(\pi+x)}=\frac{\cos x}{-\sin x}=-\cot x.\] Therefore, the correct answer is \(-\cot x\). Choosing \(\cot x\) would ignore the negative sign in the denominator. Exam tip: for an angle of the form \(\pi+x\), sine has a negative sign.

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(\tan\(\frac{3\pi}{2}+x\)) किसके बराबर है?

What is (\tan\(\frac{3\pi}{2}+x\)) equal to?

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Correct Answer

C. -\(\cot x\)

Explanation

Simple Explanation

\(\frac{3\pi}{2}+x\) पर \(\tan\) बदलकर \(\cot\) होता है और चिन्ह ऋणात्मक है। इसलिए (\tan\(\frac{3\pi}{2}+x\)=-\cot x)। / At \(\frac{3\pi}{2}+x\), \(\tan\) changes to \(\cot\) with a negative sign. Hence (\tan\(\frac{3\pi}{2}+x\)=-\cot x).

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\(\frac{1+\cos x}{\sin x}\) किसके बराबर है?

What is \(\frac{1+\cos x}{\sin x}\) equal to?

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Correct Answer

C. \(\cot \frac{x}{2}\)

Explanation

Simple Explanation

मानक अर्ध-कोण रूप \(\cot \frac{x}{2}=\frac{1+\cos x}{\sin x}\) है। \(\tan \frac{x}{2}\) और \(\cot \frac{x}{2}\) के रूप अलग रखें। / The standard half-angle form is \(\cot \frac{x}{2}=\frac{1+\cos x}{\sin x}\). Keep the forms of \(\tan \frac{x}{2}\) and \(\cot \frac{x}{2}\) separate.

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यदि \(\cosec x+\cot x=6\), तो \(\cosec x-\cot x\) का मान क्या है?

If \(\cosec x+\cot x=6\), what is the value of \(\cosec x-\cot x\)?

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Correct Answer

A. \(\frac{1}{6}\)

Explanation

Simple Explanation

(\(\cosec x+\cot x\)\(\cosec x-\cot x\)=1) होता है। इसलिए आवश्यक मान \(\frac{1}{6}\) है। / The identity is (\(\cosec x+\cot x\)\(\cosec x-\cot x\)=1). Therefore, the required value is \(\frac{1}{6}\).

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यदि \(\tan x+\cot x=5\), तो \(\tan^2 x+\cot^2 x\) का मान क्या है?

If \(\tan x+\cot x=5\), what is the value of \(\tan^2 x+\cot^2 x\)?

Explanation opens after your attempt
Correct Answer

B. 23

Explanation

Simple Explanation

दिया है \,\(\tan x+\cot x=5\)। दोनों पक्षों का वर्ग करने पर \((\tan x+\cot x)^2=\tan^2x+\cot^2x+2\tan x\cot x\) मिलता है। चूँकि \(\tan x\cot x=1\), इसलिए \(25=\tan^2x+\cot^2x+2\)। अतः \(\tan^2x+\cot^2x=23\)। विकल्प 25 केवल योग के वर्ग का मान है; उसमें से 2 घटाना आवश्यक है। परीक्षा टिप: \(\tan x\cot x=1\) का उपयोग करना न भूलें। / Given \(\tan x+\cot x=5\). Squaring both sides gives \((\tan x+\cot x)^2=\tan^2x+\cot^2x+2\tan x\cot x\). Since \(\tan x\cot x=1\), we get \(25=\tan^2x+\cot^2x+2\). Hence, \(\tan^2x+\cot^2x=23\). Option 25 is only the square of the given sum; the extra 2 must be subtracted. Exam tip: always use \(\tan x\cot x=1\) in such identities.

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\(\frac{1+\tan^2 x}{1+\cot^2 x}\) का सरल मान क्या है?

What is the simplified value of \(\frac{1+\tan^2 x}{1+\cot^2 x}\)?

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Correct Answer

A. \(\tan^2 x\)

Explanation

Simple Explanation

ऊपर \(1+\tan^2 x=\sec^2 x\) और नीचे \(1+\cot^2 x=\cosec^2 x\) है। अनुपात \(\frac{\sec^2 x}{\cosec^2 x}=\tan^2 x\) होता है। / The numerator is \(1+\tan^2 x=\sec^2 x\) and the denominator is \(1+\cot^2 x=\cosec^2 x\). Their ratio is \(\frac{\sec^2 x}{\cosec^2 x}=\tan^2 x\).

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यदि \(\cosec x-\cot x=\frac{1}{3}\), तो \(\cosec x+\cot x\) का मान क्या है?

If \(\cosec x-\cot x=\frac{1}{3}\), what is the value of \(\cosec x+\cot x\)?

Explanation opens after your attempt
Correct Answer

B. 3

Explanation

Simple Explanation

सर्वसमिका \(\cosec^2 x-\cot^2 x=1\) से \((\cosec x-\cot x)(\cosec x+\cot x)=1\) मिलता है। दिया है \(\cosec x-\cot x=\frac{1}{3}\), अतः \(\frac{1}{3}(\cosec x+\cot x)=1\)। इसलिए \(\cosec x+\cot x=3\)। \(\frac{1}{3}\) दिया हुआ व्यंजक है, उसका प्रतिलोम लेने पर 3 प्राप्त होता है। परीक्षा टिप: ऐसे प्रश्नों में \(\cosec^2 x-\cot^2 x=1\) पहचानकर दोनों संयुग्म व्यंजकों का गुणनफल लें। / Using the identity \(\cosec^2 x-\cot^2 x=1\), we get \((\cosec x-\cot x)(\cosec x+\cot x)=1\). Given \(\cosec x-\cot x=\frac{1}{3}\), so \(\frac{1}{3}(\cosec x+\cot x)=1\). Therefore, \(\cosec x+\cot x=3\). The value \(\frac{1}{3}\) is the given expression; its reciprocal gives 3. Exam tip: recognise \(\cosec^2 x-\cot^2 x=1\) and multiply the conjugate expressions in such questions.

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\(\frac{\cosec^2 x-1}{\cot^2 x}\) का सरल मान क्या है?

What is the simplified value of \(\frac{\cosec^2 x-1}{\cot^2 x}\)?

Explanation opens after your attempt
Correct Answer

C. 1

Explanation

Simple Explanation

पाइथागोरसीय त्रिकोणमितीय सर्वसमिका \(\cosec^2 x=1+\cot^2 x\) से \(\cosec^2 x-1=\cot^2 x\) मिलता है। अतः \(\frac{\cosec^2 x-1}{\cot^2 x}=\frac{\cot^2 x}{\cot^2 x}=1\), जहाँ व्यंजक परिभाषित है। \(\cot^2 x\) उत्तर नहीं है, क्योंकि यह केवल अंश का सरल रूप है। परीक्षा टिप: \(\cosec^2 x=1+\cot^2 x\) को \(\sec^2 x=1+\tan^2 x\) के साथ याद रखें। / Using the Pythagorean trigonometric identity \(\cosec^2 x=1+\cot^2 x\), we get \(\cosec^2 x-1=\cot^2 x\). Therefore, \(\frac{\cosec^2 x-1}{\cot^2 x}=\frac{\cot^2 x}{\cot^2 x}=1\), wherever the expression is defined. \(\cot^2 x\) is not the final answer because it is only the simplified numerator. Exam tip: remember \(\cosec^2 x=1+\cot^2 x\) alongside \(\sec^2 x=1+\tan^2 x\).

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यदि (x) दूसरे चतुर्थांश में है और \(\cot x=-\frac{3}{4}\), तो \(\cosec x\) का मान क्या है?

If (x) is in the second quadrant and \(\cot x=-\frac{3}{4}\), what is the value of \(\cosec x\)?

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Correct Answer

A. \(\frac{5}{4}\)

Explanation

Simple Explanation

\(\cosec^2 x=1+\cot^2 x\) से \(|\cosec x|=\frac{5}{4}\) मिलता है। दूसरे चतुर्थांश में \(\cosec x\) धनात्मक होता है। / From \(\cosec^2 x=1+\cot^2 x\), \(|\cosec x|=\frac{5}{4}\). In the second quadrant, \(\cosec x\) is positive.

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(\tan\(\frac{\pi}{2}+x\)) किसके बराबर है?

What is (\tan\(\frac{\pi}{2}+x\)) equal to?

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Correct Answer

A. \(-\cot x\)

Explanation

Simple Explanation

\(\frac{\pi}{2}+x\) पर \(\tan\) बदलकर \(\cot\) होता है और चिन्ह ऋणात्मक होता है। इसलिए (\tan\(\frac{\pi}{2}+x\)=-\cot x)। / At \(\frac{\pi}{2}+x\), \(\tan\) changes to \(\cot\) with a negative sign. Hence (\tan\(\frac{\pi}{2}+x\)=-\cot x).

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यदि \(\cot x=\frac{5}{12}\) और (x) प्रथम चतुर्थांश में है, तो \(\cos x\) का मान क्या है?

If \(\cot x=\frac{5}{12}\) and (x) is in the first quadrant, what is the value of \(\cos x\)?

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Correct Answer

C. \(\frac{5}{13}\)

Explanation

Simple Explanation

\(\cot x=\frac{5}{12}\) में आसन्न (5) और सामने (12) मानें। कर्ण (13) होगा, इसलिए \(\cos x=\frac{5}{13}\)। / For \(\cot x=\frac{5}{12}\), take adjacent as (5) and opposite as (12). The hypotenuse is (13), so \(\cos x=\frac{5}{13}\).

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यदि \(\cos x=\frac{8}{17}\) और (x) प्रथम चतुर्थांश में है, तो \(\cot x\) का मान क्या है?

If \(\cos x=\frac{8}{17}\) and (x) is in the first quadrant, what is the value of \(\cot x\)?

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Correct Answer

A. \(\frac{8}{15}\)

Explanation

Simple Explanation

\(\sin x=\frac{15}{17}\) मिलता है और \(\cot x=\frac{\cos x}{\sin x}\) होता है। इसलिए \(\cot x=\frac{8}{15}\)। / \(\sin x=\frac{15}{17}\) and \(\cot x=\frac{\cos x}{\sin x}\). Therefore, \(\cot x=\frac{8}{15}\).

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यदि \(\cot x=\frac{8}{15}\) और (x) प्रथम चतुर्थांश में है, तो \(\cosec x\) का मान क्या है?

If \(\cot x=\frac{8}{15}\) and (x) is in the first quadrant, what is the value of \(\cosec x\)?

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Correct Answer

B. \(\frac{17}{15}\)

Explanation

Simple Explanation

\(\cosec^2 x=1+\cot^2 x\) से \(\cosec x=\frac{17}{15}\) मिलता है। प्रथम चतुर्थांश में धनात्मक मान लें। / From \(\cosec^2 x=1+\cot^2 x\), \(\cosec x=\frac{17}{15}\). Take the positive value in the first quadrant.

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\(\cot x\) कहाँ अपरिभाषित होता है?

Where is \(\cot x\) undefined?

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Correct Answer

B. \(\sin x=0\)

Explanation

Simple Explanation

\(\cot x=\frac{\cos x}{\sin x}\) है, इसलिए \(\sin x=0\) पर यह अपरिभाषित होता है। हर को हमेशा ध्यान से देखें। / \(\cot x=\frac{\cos x}{\sin x}\), so it is undefined when \(\sin x=0\). Always check the denominator carefully.

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फलन \(\cot x\) का काल क्या है?

What is the period of the function \(\cot x\)?

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A. \(\pi\)

Explanation

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\(\cot x\) हर \(\pi\) के बाद अपना मान दोहराता है। \(\tan x\) और \(\cot x\) दोनों का काल \(\pi\) है। / \(\cot x\) repeats its value after every \(\pi\). Both \(\tan x\) and \(\cot x\) have period \(\pi\).

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(\tan\(\frac{\pi}{2}-x\)) किसके बराबर है?

What is (\tan\(\frac{\pi}{2}-x\)) equal to?

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B. \(\cot x\)

Explanation

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\(\frac{\pi}{2}\) के पूरक कोण में \(\tan x\) बदलकर \(\cot x\) हो जाता है। पूरक पहचान याद रखें। / For a complementary angle with \(\frac{\pi}{2}\), \(\tan x\) changes to \(\cot x\). Remember cofunction identities.

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\(\cosec^2 x-\cot^2 x\) का मान क्या है?

What is the value of \(\cosec^2 x-\cot^2 x\)?

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B. (1)

Explanation

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क्योंकि \(\cosec^2 x=1+\cot^2 x\), अंतर (1) होगा। यह पहचान \(\sin^2 x+\cos^2 x=1\) से जुड़ी है। / Since \(\cosec^2 x=1+\cot^2 x\), the difference is (1). This identity is linked to \(\sin^2 x+\cos^2 x=1\).

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\(\cot x\) को \(\sin x\) और \(\cos x\) के रूप में कैसे लिखा जाता है?

How is \(\cot x\) written in terms of \(\sin x\) and \(\cos x\)?

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B. \(\frac{\cos x}{\sin x}\)

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सह-फलन की भागफल पहचान के अनुसार \(\cot x=\frac{\cos x}{\sin x}\) होता है, इसलिए विकल्प B सही है। विकल्प A, \(\tan x=\frac{\sin x}{\cos x}\), का सूत्र है; अतः वह \(\cot x\) नहीं है। ध्यान दें कि \(\cot x\) तभी परिभाषित है जब \(\sin x\ne0\) हो। परीक्षा टिप: \(\tan x\) में sin ऊपर और cos नीचे होता है, जबकि \(\cot x\) में क्रम उलटा होता है। / By the quotient identity, \(\cot x=\frac{\cos x}{\sin x}\), so option B is correct. Option A is the formula for \(\tan x=\frac{\sin x}{\cos x}\), not for \(\cot x\). Note that \(\cot x\) is defined only when \(\sin x\ne0\). Exam tip: in \(\tan x\), sine is in the numerator and cosine in the denominator; for \(\cot x\), the order is reversed.

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\(\tan \theta \cdot \cot \theta\) का मान क्या होता है?

What is the value of \(\tan \theta \cdot \cot \theta\)?

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B. \(1\)

Explanation

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परिभाषा के अनुसार \(\tan\theta=\frac{\sin\theta}{\cos\theta}\) तथा \(\cot\theta=\frac{\cos\theta}{\sin\theta}\)। अतः \(\tan\theta\cdot\cot\theta=\frac{\sin\theta}{\cos\theta}\cdot\frac{\cos\theta}{\sin\theta}=1\), जहाँ दोनों फलन परिभाषित हों। \(0\) केवल कुछ अन्य त्रिकोणमितीय गुणनफलों में आ सकता है, इस गुणनफल में नहीं। परीक्षा टिप: व्युत्क्रम त्रिकोणमितीय अनुपातों का गुणनफल सामान्यतः \(1\) होता है। / Using the definitions, \(\tan\theta=\frac{\sin\theta}{\cos\theta}\) and \(\cot\theta=\frac{\cos\theta}{\sin\theta}\). Therefore, \(\tan\theta\cdot\cot\theta=\frac{\sin\theta}{\cos\theta}\cdot\frac{\cos\theta}{\sin\theta}=1\), wherever both functions are defined. It is not \(0\); tangent and cotangent are reciprocal ratios. Exam tip: the product of reciprocal trigonometric ratios is usually \(1\).

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(\cot\(\theta+\pi\)) किसके बराबर होता है?

What is (\cot\(\theta+\pi\)) equal to?

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A. \(\cot \theta\)

Explanation

Simple Explanation

\(\cot \theta\) का काल \(\pi\) होता है। इसलिए (\cot\(\theta+\pi\)) का मान \(\cot \theta\) ही रहता है। / The period of \(\cot \theta\) is \(\pi\). Therefore (\cot\(\theta+\pi\)) remains \(\cot \theta\).

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